Black satin evening gown with pearl neckline

I lost my black satin evening gown yesterday around 6pm after a formal event at the Memorial Union on the ISU campus in Ames. It's a Adrianna Papell floor-length gown, size 6, with a pearl-embellished neckline that really catches the light. The inside lining has a pale pink monogram 'A.M.' and there's a small two-inch snag along the hem from stepping on a curb outside the coat check. It holds sentimental value—I wore it to my cousin's wedding last year—and I really need it back if anyone finds it.